|Allan Hills A81208|
|Basic information||Name: Allan Hills A81208|
This is an OFFICIAL meteorite name.
This meteorite may also be called Allan Hills 81208 (ALH 81208) in publications.
Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 1.6 g
This is 1 of 155 approved meteorites classified as Mesosiderite. [show all]
Search for other: Metal-rich meteorites, Mesosiderites
Writeup from AMN 7(2):
Sample No.: ALHA81208
Location: Allan Hills
Field No.: 1663
Weight (gms): 1.6
Meteorite Type: Diogenite/Mesosiderite
Physical Description: Roberta Score
Evaporite deposit coats the oxidized fusion crust that completely covers this meteorite. The interior is extensively weathered and the stone crumbled when it was chipped. Dimensions: 2.5 x 1 x 0.5 cm
Petrographic Description: Brian Mason
The thin section consists almost entirely of orthopyroxene clasts, ranging up to 3 mm in maximum dimension. Accessory chromite is present. The individual clasts are rimmed by dark brown to black material, which consists in part of limonite. Remnants of fusion crust are present, and have an outer crust of brown limonite. Microprobe analyses show that the pyroxene is essentially uniform in composition, except for some variation in calcium content (CaO 1.2-2.5%); mean composition is Wo3Fs25 (A12O3 0.7%, TiO2 0.14%, MnO 0.6%). The meteorite is classified as a diogenite, although the amount of limonite suggests that it may be a silicate fragment from a mesosiderite.
|References:||Published in Antarctic Meteorite Newsletter 7(2) (1984), JSC, Houston|
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
This is 1 of 34686 approved meteorites from Antarctica (plus 6183 unapproved names)
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